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The Beatings Will Continue Until Morale Improves: Cohost and the Fate of Centralized Platforms
(audiovalentine.com)
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No! That's exactly what you can't do, because if you tried you'd get banned by the admin! In your scenario, there are no admins to stop such a bad actor. But ultimately admins control what communities are on their instance, so you can't just hijack all communities like that.